Which of the following statements concerning the variance are correct? (note: there can be more than one correct answer)

a.The larger the variance, the greater the total risk of the investment.

b.If a stock portfolio is well-diversified, then the portfolio variance may be less than the variance of the least risky stock in the portfolio.

c.The larger the variance, the smaller the standard deviation.

d.The larger the variance, the more the actual returns tend to differ from the average return.

e.The variance is the best measure of risk for an asset held in isolation